There parameters normally do not need to be altered.
Overrun Cutoff
This determines when the ECU will cut fuel to the injectors upon closed throttle deceleration conditions. The tables set the manifold pressure where the injectors are closed vs rpm. Decreasing the cutoff pressure may help surge conditions at low rpm and light throttle opening, especially with big injectors.
Always make sure the rpm increases throughout these tables.
Overrun cutoff min rpm - sets the rpm where the injectors will restart during overrun.